I am a total physics idiot, but I do enjoy writing, I do enjoy science fiction, and I'd like to run this concept by people who know they're talking about. So - time is relative, yes? If I count five seconds where I am, it is possible that ten seconds are passing in that same span of time for someone elsewhere, yes? So, I'm in a room where time moves five times faster on one side than on the other. I throw a baseball at 10 mph from the fast side to the slow side - does anything actually happen to the velocity of the ball? Does it appear to me to slow down, even though it velocity never changes; or does it hit the wall of the slow side at 50 mph? I suspect I know the answer to this (it would just look like it got slower to me without actually changing velocity, right?) so I'll ask one more to my point. Let's assume there's a box; time moves five times faster inside this box than it does outside. If I were to put my hand inside the box, what would happen? Particularly consider my blood -it's now flowing into an area where time moves faster, and flowing out of that arm into an area where time moves slower. This might be more of a biology question, insofar as it's a respectable question at all, but would I suffer any deleterious effects by putting my arm in such a box?